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Topic: Engine hook bolts on manifold (Read 26313 times)

Edgemontvillage was referring to the engine orange on the head surface between the valve cover and intake manifold... ie. the upper part of the machined surface for intake gasket... which normally would not get painted on such an engine (with aluminum manifold and aluminum valve covers)..

For the small population of original cars I've looked at it seems many 69's and later (70 LT1's) had natural lift hooks. There was a real debate about this on the Yenko site sometime back. On our 68 I have them painted but here is a late Sept. 69 built Z/28 survivor with no paint.

Thanks Chick that is what I thought. I assumed that the hooks got painted on the assembly line where the motors got painted as an assembly. For an aluminum intake with painted lift hooks, either the hooks would have been painted separately or they would have been painted in place with considerable overspray. Most original intakes that I have seen had minimal overspray on '69's and '70's.

Lift hooks on engines with aluminum intakes are known to have been brush-painted to match during assembly.

My 1968 07C z28 lift hooks were painted aluminum. Also, what was strange was the intake manifold bolts.....they were standard phosphate coated bolts that had been painted aluminum, even the lift hook bolts were standard hex head bolts painted aluminum. They must have run out of zinc plated ones and used what was available and painted them later. Also my distributor hold down and bolt was painted aluminum.

For the small population of original cars I've looked at it seems many 69's and later (70 LT1's) had natural lift hooks. There was a real debate about this on the Yenko site sometime back. On our 68 I have them painted but here is a late Sept. 69 built Z/28 survivor with no paint.

So were all the bolts used on the intake manifold the same head marking? I removed some recently that have no marking at all. Then they would not be original I assume? The motor had minimal work done to it before my ownership, so I would not have thought these to be replaced? Hex head and Had washers underneath as well. Guess the washers prevent damage to the aluminum of the manifold.

For the small population of original cars I've looked at it seems many 69's and later (70 LT1's) had natural lift hooks. There was a real debate about this on the Yenko site sometime back. On our 68 I have them painted but here is a late Sept. 69 built Z/28 survivor with no paint.

From the pic you posted there is silver paint still on that bracket.

That was what I thought also.....looks just like mine before I cleaned them. Another thing about the aluminum silver painted distributor hold down and bolt....they weren't to neat about painting them, apparently they used a brush as there was a lot of brush applied paint on the distributor wire.

So were all the bolts used on the intake manifold the same head marking? I removed some recently that have no marking at all. Then they would not be original I assume? The motor had minimal work done to it before my ownership, so I would not have thought these to be replaced? Hex head and Had washers underneath as well. Guess the washers prevent damage to the aluminum of the manifold.

Jimmy....there were two different lengths of intake manifold bolts that I know of and each of them had different head markings. The short ones were used on the manifold holes that had no other parts attached or thin metal brackets and the longer ones were used on the holes with thicker brackets attached to the manifold...such as the smog bracket, lift hook, and alternator bracket.

Good point Charlie! I need to look at that car again when the opportunity arises to check the bolts and better close up of the hook. Jerry, interesting on your 68! My wire dist. holder just had very slight surface rust with nothing on it. Bolt similar! Steve, have you observed any 67 or early 68 survivors with the hooks orange? Know you've seen a bunch compared to a couple on my end.......

So were all the bolts used on the intake manifold the same head marking? I removed some recently that have no marking at all. Then they would not be original I assume? The motor had minimal work done to it before my ownership, so I would not have thought these to be replaced? Hex head and Had washers underneath as well. Guess the washers prevent damage to the aluminum of the manifold.

Jimmy one other thing on the manifold bolts....my understanding is that (and it may be wrong) the manifold bolts were first installed at the engine plant and they were all the short ones. When the engine arrived at the auto assembly plant dress line, the short bolts were removed and the other ones added as the equipment was installed. Thus, you could have different head stampings because you are dealing with two different plants.

Oops, forgot something, the AIM states that the orange alternator bracket on the '68 Z28 was part of the engine assembly (wouldn't apply to a '69), so this item might get a longer bolt at the engine plant. Also the AIM states that the spark plug wire towers were also part of the engine assembly, but these were thinner so maybe they used the short bolts. I haven't been able to determine where the engine hooks were installed, at the engine plant or the assembly line dress plant. Maybe someone else might know for sure.

This is an interesting subject. Lets keep it going if we can. I know I don't have original intake bolts on my 69 Z and the lift hooks are painted orange, I painted the lift hooks myself and the bolts are from Ricks 1st Gen. So how many different bolts were used and what lengths would be a good place to start for a 69 Z intake?

Here is a clear pic of ours off our 68Z. This is one of the three originals. Our 68 had one each used for the engine lift hooks and one used for alternator support.

Jerry, this is the one that was in our orange bracket, the same type used for the engine hooks. Had three of these bolts and the bracket had the larger diameter impression from when it had been torqued. The one shown is one of the three originals that I had glass beaded and had re-coated with clear zinc.